The field experiment was conducted at Agricultural Research Station, Siruguppa during kharif 2016 to assess the
feasibility of chlorophyll meter (SPAD) and optical sensor (Green seeker) for nitrogen management in dry direct seeded rice
(DSR). The experiment was laid out in randomized complete block design with eight treatments and three replications. Treatments
included variable rates of nitrogen i.e. 0%, 50%, 100% and 150% of the recommended N along with recommended P and K. The
above set of treatments was studied in combination with and without FYM @ 101 ha-1. The periodic observations on plant growth
parameters and recordings of crop sensors data was made at 15 days intervals from 30 to 105 DAS. Moreover, the laboratory
estimation of leaf chlorophyll and leaf N content was also made on the same day. The correlation coefficients of sensor readings
showed a strong correlation with the plant growth parameters, leaf chlorophyll and leaf N content estimated at different days of
crop growth period and ultimately with the grain yield of DSR. Thus, indicating that there is every chance in better utility of crop
sensor readings in nitrogen management by developing threshold limits for these values.